The improvement of the quality of life (QoL) is one of the key treatment goals in patients with diabetes mellitus. Objective: Prospective study to evaluate the impact of structured diabetes education on the QoL in insulin-treated, elderly patients with type 2 diabetes mellitus. Inpatients with insulin treated type 2 diabetes or failure of oral antidiabetic therapy were successively recruited and participated in the structured inpatient diabetes treatment and teaching program (DTTP) for insulin therapy QoL was assessed before and six months after participation in the DTTP with the standardised questionnaire of Lohr analysing the subscales: social relations, physical complaints, worries about the future, diet restrictions, fear of hypoglycemia, and daily struggles.